Im doin the usual research and looking for a set of pistons....my brother recently swapped out his JDM B18C ones for some ITR ones, so i can get his for free, just need to buy rings...and i discovered with a thinner 2 layer headgasket id achieve a 10.8 compared to the 10.1 stock compression...HOWEVER, i also did reasearch on installing a set of JDM CTR pistons, and even with a stock headgasket id achieve a compression ratio of 12.0:1. now heres the question, im gonna do skunk2 stage 2 cams soon also and i was wondering what the downfalls are to installing the CTR pistons and reaching such sick compression? with a misfire up high? do i need to upgrade anything else if i plan to only rev to maybe 8500 with modded headwork? is it worth paying for the CTR and installing those over the free JDM GSR in the long run?
thanx in advance for any help or opinions...btw, we will be installing them, so no installation charges apply :thumbup:
edit: im in a 94 GSR i/h/e , didnt include that sorry

 

Skunk2 stage 2 cams are designed to work with high compression engines. so the CTR pistons would work best.

but that would require some extensive fuel and timing curve tuning. so you would at least have to get APEX'i V-AFC, but i would recommend Hondata, and have it tuned by a reputable shop.

 

I'm with XSrcing, tuning is vital to the survival of a high compression daily driven motor. Your info says you're from Chicago, so I'm assuming you dont have to deal with the 91 octane crap we get here in California. You probably have access to 93 or higher.

The higher octane burns slower, providing more resistance to detonation among other things which a high compression motor yields.

 

IMHO, anything over 11.5:1 is a little risky for street driven engines. Yes, it will yield greater power, but there is a lot of risk associated with high compression engines.

Granted, I've heard of 12.5+ on pump gas. It is possible, but not wise if you can't afford a spare engine.

 

I am running ctr pistons on my gsr. What kind of tuning do you reccomend.

 

Fuel and Ignition Timing maps, for the most part. Cam gears if you have them. The best thing you can do is get your car on a dyno, and have an experienced Honda/Acura Mechanic do it for you, but seeing that you're from OK, I dont know what you can do. Hondata makes very good ECU upgrades and modifications, go check them out.

 

For an OBDI car the best route would be to get a base-level Hondata s100 and have it tuned on a dyno by someone who knows what they're doing. For OBDII cars you can run a Hondata with a little more effort by converting the car to OBDI, or you can achieve good results by tuning with a piggyback fuel computer like a V-AFC.

Granted, the stock ignition timing map is maybe a little aggressive for that kind of CR (and the V-AFC provides no ignition timing adjustment) but if you richen up the fuel mixture a tad you can keep away the detonation.